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AM (ante meridiem) literally means before midday. This is from 12 midnight (00:00) to 11:59 in the morning. PM (post meridiem) means after midday. The range of PM is from 12 noon to 11:59 that same night. That’s the am pm meaning in plain English, straightforward huh? AM covers the time from midnight (12:00 AM) to just before noon (11:59 AM), while PM covers noon (12:00 PM ) to just before the next midnight (11:59 PM ). This distinction divides the 24-hour day into two 12-hour periods for clear time identification. AM and PM are abbreviations of Latin phrases that indicate whether it is before or after midday in the 12-hour clock format. Learn the history, issues, writing rules, and conversion of AM and PM with examples and references. AM stands for ante meridiem, meaning before noon, and PM stands for post meridiem, meaning after noon. Learn how to use these abbreviations correctly in the 12-hour clock system and how to convert them to the 24-hour format.